<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>border-radius圆角</title>
  <style>
    div {
      float: left;
      width: 300px;
      height: 300px;
      margin: 20px;
      background-color: green;
      /* border-radius:50px/50px; */
      /* border-radius:50%; */
    }
  </style>
</head>

<body>
<div class="box1"></div>

<div class="box2"></div>

<div class="box3"></div>

<div class="box4"></div>

<div class="box5"></div>
</body>
</html>
